I've made parts to model every Falcon 9 mission flown to date. In general, I've created these parts:

• first stage engine section
• clamps that attach the second stage to the interstage
• for newer versions: grid fins and landing legs
• payload: choose either a payload fairing or a Dragon spacecraft
• I haven't created parts for the rocket stages, because these are easy to scratchbuild from 1"/25 mm PVC pipe.
• You also have to scratchbuild the conduits that run on each side of the stage.

This list shows you what parts you need for each version of the rocket. The links go to the Shapeways website, where you can order the parts. All parts are available in 1:144, some parts are available in other scales too (I've made 1:200, 1:100, 1:88 and 1:72 parts so far). If the scale you want isn't listed, contact me, I might be able to supply scaled parts.

• Falcon 9 v1.0 (3x3 engines)
  • Engine set
  • Engine section (the bottom part of the first stage)
  • Second stage clamps
  • payload: choose either a payload fairing or a Dragon spacecraft
  • Dragon 1 capsule
  • Payload fairing
• Falcon 9 v1.1 (started with mission B-1001)
  • New features: stages are taller, engines are in a new arrangement (Octaweb), new engine type (Merlin 1D)
  • Engine set with second stage clamps
  • Some v1.1 missions had landing legs and grid fins for landing experiments: Landing legs and grid fins
  • payload: choose either a payload fairing or a Dragon spacecraft
  • Dragon 1 capsule
  • Payload fairing
• Falcon 9 v1.2 Block 1, 2 or 3 (also known as F9 Full Thrust / stretched, started with mission B-1019)
  • New features: stages are taller than v1.1
  • Engine set with second stage clamps
  • If you want to model a mission that included a first stage landing: Landing legs and grid fins
  • payload: choose either a payload fairing or a Dragon spacecraft
  • Dragon 1 capsule
  • Payload fairing
• Falcon 9 v1.2 Block 4
  • New features: larger grid fins made in Titanium
  • Engine set with second stage clamps
  • If you want to model a mission that included a first stage landing: Landing legs and grid fins
  • payload: choose either a payload fairing or a Dragon spacecraft
  • Dragon 1 capsule
  • Payload fairing
• Falcon 9 v1.2 Block 5 (forthcoming, starting with mission B-1045 or B-1046)
  • New features: unknown
  • Engine set with second stage clamps
  • If you want to model a mission that included a first stage landing: Landing legs and grid fins
  • payload: choose either a payload fairing or a Dragon spacecraft
  • Dragon 1 capsule
  • Payload fairing
• Falcon Heavy Demo 1 mission:
  • 1x: Engine set with second stage clamps for the center core
  • 2x: Landing legs and grid fins for the side boosters
  • 1x: Landing legs and grid fins for the center core
  • 1x: Nose cones for the 2 side boosters
  • 2x: Engine set for the side boosters
  • 1x: Payload fairing

Instructions for building a model using these parts

For reference, here's a list of Falcon 9 missions, which shows what Falcon version was used for each mission. The "F9 FT" in that list is my "v1.2 Block 1, 2 or 3"